B4R Question About SSD1306 and ESP8266 screen

Cesar_Morisco · Jul 4, 2023

hello people
In terms of connecting the SSD1306 display to the esp8266 it doesn't work I use pin D1 and D2 It doesn't work here the example I'm using could someone help about the output pins to use.
I thank

SSD1306:

Sub Process_Globals
    Public Serial1 As Serial
    Public WiFi As ESP8266WiFi
    Public Udp As WiFiUDP
    Public WifiSSID As String="xxx"
    Public WifiPass As String="xxx"
    Private ssd As AdafruitSSD1306
    Private d1pins As D1Pins
    
    
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    ssd.InitializeI2C(d1pins.D6, 0x3c)
    
    ssd.ClearDisplay
    ssd.GFX.SetCursor(0, 0)
    ssd.GFX.ConfigureText(2, ssd.WHITE, False)
    ssd.GFX.DrawText("Wifi ...").DrawText(CRLF).DrawText(CRLF)
    ssd.Display
  
    If WiFi.IsConnected=False Then
        ConnectToNetwork
    End If
    
    'Udp.Initialize(8888,"UDP_PacketArrived")
    ssd.ClearDisplay
    ssd.GFX.SetCursor(0, 0)
    ssd.GFX.ConfigureText(2, ssd.WHITE, False)
    ssd.GFX.DrawText("Wifi .. OK").DrawText(CRLF).DrawText(CRLF)
    ssd.GFX.DrawText("No UDP Data")
    ssd.Display
End Sub

Sub ConnectToNetwork
    If WiFi.IsConnected Then
        Return
    End If
    If WiFi.Connect2(WifiSSID, WifiPass) Then
        Log("Connected successfully to: ", WifiSSID)
        Log(WiFi.LocalIp)
    Else
        Log("Failed to connect.")
    End If
End Sub

teddybear · Jul 6, 2023

Try to change i2c address 0x3c to 0x3d.

Cesar_Morisco · Jul 6, 2023

Thanks for the answer I did as you said and it doesn't work
There is nothing on the display

ssd.InitializeI2C(d1pins.D6, 0x3d):

Mark Read · Jul 7, 2023

You could try an I2C Scanner. Here is one for the Arduino IDE.

What ESP are you using?

B4X:

/*********
  Rui Santos
  Complete project details at https://randomnerdtutorials.com 
*********/

#include <Wire.h>
 
void setup() {
  Wire.begin();
  Serial.begin(9600);
  Serial.println("\nI2C Scanner");
}
 
void loop() {
  byte error, address;
  int nDevices;
  Serial.println("Scanning...");
  nDevices = 0;
  for(address = 1; address < 127; address++ ) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address<16) {
        Serial.print("0");
      }
      Serial.println(address,HEX);
      nDevices++;
    }
    else if (error==4) {
      Serial.print("Unknow error at address 0x");
      if (address<16) {
        Serial.print("0");
      }
      Serial.println(address,HEX);
    }   
  }
  if (nDevices == 0) {
    Serial.println("No I2C devices found\n");
  }
  else {
    Serial.println("done\n");
  }
  delay(5000);         
}

Mark Read · Jul 7, 2023

Have you tried the examples in Erel's post? https://www.b4x.com/android/forum/threads/radafruitssd1306-oled-displays.68906/#content

teddybear · Jul 7, 2023

Mark Read said:

You could try an I2C Scanner. Here is one for the Arduino IDE.

What ESP are you using?

B4X:

/*********
  Rui Santos
  Complete project details at https://randomnerdtutorials.com
*********/

#include <Wire.h>
 
void setup() {
  Wire.begin();
  Serial.begin(9600);
  Serial.println("\nI2C Scanner");
}
 
void loop() {
  byte error, address;
  int nDevices;
  Serial.println("Scanning...");
  nDevices = 0;
  for(address = 1; address < 127; address++ ) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address<16) {
        Serial.print("0");
      }
      Serial.println(address,HEX);
      nDevices++;
    }
    else if (error==4) {
      Serial.print("Unknow error at address 0x");
      if (address<16) {
        Serial.print("0");
      }
      Serial.println(address,HEX);
    } 
  }
  if (nDevices == 0) {
    Serial.println("No I2C devices found\n");
  }
  else {
    Serial.println("done\n");
  }
  delay(5000);       
}

Here is a b4r snippet for i2c address scanner , The esp is 8266. what is the electric circuit diagram?

Mark Read · Jul 7, 2023

XorAndOr said:
You are using i2c of esp8266 nodeMCU D1 scl and D2 sda....
but in your code in initialization you use pin D6...is that correct?
it should be

B4X:

ssd.InitializeI2C(d1pins.D1, 0x3c)

As far as i know, his code is correct if Pin D6 is free. Here is my setup.

Cesar_Morisco · Jul 7, 2023

Hello
Thanks again everyone.
In the scan on the arduino it works very well
In B4R No

teddybear · Jul 7, 2023

XorAndOr said:
ssd.InitializeI2C(d1pins.D1, 0x3c)

The first parameter of InitializeI2C is not SCL, but RST, even if you pass -1, it also works

XorAndOr said:
Just out of curiosity.. do you know if it works the same on nodemcu 8266(no wemos)?

Yes, it works on nodemcu 8266

candide · Jul 7, 2023

if you are using wemos D1 mini,
D1 is GPI05 => pin = 5 for your init
D2 is GPIO4 => pin = 4 for your init
by default SCL is pin 5 and SDA is pin 4 (GPIO is the pin corresponding at arduino)

Cesar_Morisco · Jul 7, 2023

Yes I am using NodeMCU ESP8266
D1 and D2
Look at the photo and the same configuration that I am using here

candide · Jul 8, 2023

first step is to check if slave I2C is seen with I2C-scanner provided above :
- what is result of this script ?

Cesar_Morisco · Jul 8, 2023

hello all
Here for me everything goes wrong kkkk
I've done as friends said and it doesn't work for me here the settings I'm using
If anyone has any more advice, I'd appreciate it.

teddybear · Jul 8, 2023

Cesar_Morisco said:
hello all
Here for me everything goes wrong kkkk
I've done as friends said and it doesn't work for me here the settings I'm using
If anyone has any more advice, I'd appreciate it.

1.You'd better post the project, File ->Export As Zip
2.Show us your electric circuit picture as below

Mark Read · Jul 9, 2023

There is only one thing I can think of. In the directory for rAdafruitSSD1306, there is a file called Adafruit_SSD1306.h. If you open the file with a good text editor (Notepad++ for example) and scroll to line 73. You can see that you have to set the resolution of the display. Have you done/tried this?

Lines 55 to 76 from Adafruit_SSD1306.h:

#define SSD1306_I2C_ADDRESS   0x3C  // 011110+SA0+RW - 0x3C or 0x3D
// Address for 128x32 is 0x3C
// Address for 128x64 is 0x3D (default) or 0x3C (if SA0 is grounded)

/*=========================================================================
    SSD1306 Displays
    -----------------------------------------------------------------------
    The driver is used in multiple displays (128x64, 128x32, etc.).
    Select the appropriate display below to create an appropriately
    sized framebuffer, etc.

    SSD1306_128_64  128x64 pixel display

    SSD1306_128_32  128x32 pixel display

    SSD1306_96_16

    -----------------------------------------------------------------------*/
   #define SSD1306_128_64 <-- comment or uncomment as required! This works for the 0.96" OLED.
//   #define SSD1306_128_32
//   #define SSD1306_96_16
/*=========================================================================*/

As I said before, your code looks correct. Have you a second OLED to try?

Mark Read · Jul 9, 2023

Just an after thought, what Arduino IDE version are you using?

Cesar_Morisco · Jul 9, 2023

Hello everything is fine

SSD1306:

#define SSD1306_I2C_ADDRESS   0x3C  // 011110+SA0+RW - 0x3C or 0x3D
// Address for 128x32 is 0x3C
// Address for 128x64 is 0x3D (default) or 0x3C (if SA0 is grounded)

/*=========================================================================
    SSD1306 Displays
    -----------------------------------------------------------------------
    The driver is used in multiple displays (128x64, 128x32, etc.).
    Select the appropriate display below to create an appropriately
    sized framebuffer, etc.

    SSD1306_128_64  128x64 pixel display

    SSD1306_128_32  128x32 pixel display

    SSD1306_96_16

    -----------------------------------------------------------------------*/
//   #define SSD1306_128_64
   #define SSD1306_128_32
//   #define SSD1306_96_16
/*=========================================================================*/

SSD1306:

I made the same clock file and the one you are using does not work

Sub Process_Globals

Public Serial1 As Serial

Private wifi As ESP8266WiFi

Private clock As Timer

Private ssd As AdafruitSSD1306

Private d1pins As D1Pins

End Sub

Private Sub AppStart

Serial1.Initialize(115200)

Log("AppStart")

'example of connecting to a local network

If wifi.Connect2("Help-Info Central Tec 2.4G", "Pp1c2s3m4") Then

Log("Connected to network")

TimeNIST.Start

clock.Initialize("clock_Tick", 1000)

ssd.InitializeI2C(d1pins.D1, 0x3c)

ssd.ClearDisplay

TimeIsAvailable

Else

Log("Failed to connect to network")

End If

End Sub

Public Sub TimeIsAvailable

clock.Enabled = True

End Sub

Private Sub Clock_Tick

ssd.ClearDisplay

ssd.GFX.SetCursor(0, 0)

ssd.GFX.ConfigureText(1, ssd.WHITE, False)

ssd.GFX.DrawText("Date: ").DrawText(TimeNIST.GetDate).DrawText(CRLF).DrawText(CRLF)

ssd.GFX.ConfigureText(2, ssd.WHITE, False)

ssd.GFX.DrawText(NumberFormat(TimeNIST.GetHours, 2, 0)).DrawText(":").DrawText(NumberFormat(TimeNIST.GetMinutes, 2, 0))

ssd.GFX.DrawText(":").DrawText(NumberFormat(TimeNIST.GetSeconds, 2, 0))

ssd.Display

End Sub[/CODE]

Mark Read · Jul 10, 2023

Its good news when everything works. Please use </>CODE tags when posting.

What did you do to get it working? The only thing I can see is the initialise with Pin1.

Cesar_Morisco · Jul 10, 2023

I want to thank everyone

Now it worked
Here is the code I used As I said I've been using this amazing tool for a few days. I have a lot to learn from you guys thank you so much dear

SSD1306:

Sub Process_Globals
    Public Serial1 As Serial
    Private wifi As ESP8266WiFi
    Private clock As Timer
    Private ssd As AdafruitSSD1306
    Private d1pins As D1Pins
    Private WifiSSID As String=" "
    Private WifiPass As String=" "
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    'example of connecting to a local network
    ssd.InitializeI2C(d1pins.D6, 0x3c)            'initialise SSD1306
    ssd.ClearDisplay
    ssd.GFX.SetCursor(0, 0)
    ssd.GFX.ConfigureText(2, ssd.WHITE, False)
    ssd.GFX.DrawText("Wifi ...").DrawText(CRLF).DrawText(CRLF)
    ssd.Display
    If wifi.IsConnected=False Then
        ConnectToNetwork
    End If
  
End Sub

Sub ConnectToNetwork
    If wifi.IsConnected Then
        Return
    End If
    If wifi.Connect2(WifiSSID, WifiPass) Then
        Log("Connected successfully to: ", WifiSSID)
        Log(wifi.LocalIp)
        ssd.ClearDisplay
        ssd.GFX.SetCursor(0, 0)
        ssd.GFX.ConfigureText(2, ssd.WHITE, False)
        ssd.GFX.DrawText("Wifi .. OK").DrawText(CRLF).DrawText(CRLF)
        ssd.GFX.DrawText("IP:")
        ssd.GFX.DrawText(wifi.LocalIp).DrawText(CRLF).DrawText(CRLF)
        ssd.Display
      
        TimeNIST.Start
        clock.Initialize("clock_Tick", 1000)
        TimeIsAvailable
      
    Else
        Log("Failed to connect.")
    End If
End Sub


Public Sub TimeIsAvailable
    clock.Enabled = True
End Sub

Private Sub Clock_Tick
    ssd.ClearDisplay
    ssd.GFX.SetCursor(0, 0)
    ssd.GFX.ConfigureText(1, ssd.WHITE, False)
    ssd.GFX.DrawText("Date: ").DrawText(TimeNIST.GetDate).DrawText(CRLF).DrawText(CRLF)
    ssd.GFX.ConfigureText(2, ssd.WHITE, False)
    ssd.GFX.DrawText(NumberFormat(TimeNIST.GetHours, 2, 0)).DrawText(":").DrawText(NumberFormat(TimeNIST.GetMinutes, 2, 0))
    ssd.GFX.DrawText(":").DrawText(NumberFormat(TimeNIST.GetSeconds, 2, 0))
    ssd.Display
End Sub

B4R Question About SSD1306 and ESP8266 screen

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